Thermal strain measurement of joint materials over a small spatial region using statistical interferometry

Hirofumi Kadono; Hirofumi Kitajima; Satoru Toyooka

doi:10.1117/12.354986

19 July 1999 Thermal strain measurement of joint materials over a small spatial region using statistical interferometry

Hirofumi Kadono, Hirofumi Kitajima, Satoru Toyooka

Proceedings Volume 3749, 18th Congress of the International Commission for Optics; (1999) https://doi.org/10.1117/12.354986
Event: ICO XVIII 18th Congress of the International Commission for Optics, 1999, San Francisco, CA, United States

Abstract

Statistical interferometry is applied to the measurement of thermal strain of object having an interface of two different materials. The technique is based on the statistics of the fully developed speckle field. The complete randomness of the speckle phase can play the role of a standard phase in a statistical sense, and the phase of the object under testing can be derived in a statistical way, in contrast to the conventional interferometry. In this study, the optical system is optimized to measure the thermal strain in a very small region around the interface of joint specimen. Experimental results show that the present method permits the measurement of strain with the accuracy approximately 10^-6 with a spatial resolution > 50 micrometers .

Citation Download Citation

Hirofumi Kadono, Hirofumi Kitajima, and Satoru Toyooka "Thermal strain measurement of joint materials over a small spatial region using statistical interferometry", Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); https://doi.org/10.1117/12.354986

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